The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 1998
Filed:
May. 18, 1993
Kaveh Kianush, Eindhoven, NL;
Wolter Bijker, Eindhoven, NL;
Wolfdietrich G Kasperkovitz, Eindhoven, NL;
Hendricus C De Ruyter, Eindhoven, NL;
Willem A Sloof, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
An FM receiver having an RF section, a first tunable mixer stage for the frequency conversion of a desired RF FM reception signal into a first intermediate frequency signal, an IF device and an FM demodulator. In order to enhance the integration of the apparatus, while maintaining a signal processing ability which is free from distortion, the FM receiver includes circuitry incorporated in the signal path for converting a single-phase signal into a pair of signals in mutual phase quadrature. The pair of phase-quadrature signals is applied to in-phase and quadrature signal paths of the IF device. The IF device having a polyphase IF filter incorporated in the in-phase and quadrature signal paths and has a bandpass characteristic which is symmetrical around its resonance frequency. The polyphase IF filter is coupled to the FM demodulator.